package Read;

import Service.TeacherService;
import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import org.example.Teacher;
import util.Condition;
import util.JSONUtil;
import util.Pagination;
import util.TeacherControllerHelper;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.sql.SQLException;
import java.util.Collection;
import java.util.List;

@WebServlet("/teacherRead.ctl")
public class TeacherReadCtl extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    //设置响应字符编码为UTF-8
    response.setContentType("application/json;charset=UTF-8");//创建JSON对象message，以便往前端响应信息
    JSONObject message_jsonObj = new JSONObject();
    String req_jsonStr = JSONUtil.getJSON(request);
    JSONObject req_jsonObj = JSON.parseObject(req_jsonStr, JSONObject.class);
    if (req_jsonObj == null) {
        message_jsonObj.put("message", "未收到请求信息");
        response.getWriter().println(message_jsonObj);
        return;
    }
    try {
        Pagination pagination = TeacherControllerHelper.getPagination(req_jsonObj);
        List<Condition> conditionList = TeacherControllerHelper.getCondition(req_jsonObj);
        Collection<Teacher> teachers = TeacherService.getInstance().findAll(conditionList,pagination);
        message_jsonObj.put("totalNum",pagination.getTotalNum());
        message_jsonObj.put("records",teachers);
        response.getWriter().println(message_jsonObj);
    } catch (SQLException e) {
        message_jsonObj.put("message", "数据库操作异常");
        response.getWriter().println(message_jsonObj);
        e.printStackTrace();
    } catch (Exception e) {
        message_jsonObj.put("message", "网络异常");
        response.getWriter().println(message_jsonObj);
        e.printStackTrace();
    }
}
}
